Hello,
I fitted a No 8 sight to my 1912 Straight Hand Stock BSA Light pattern together with a PH foresight tube. I also needed to remove and blank the standard rear sight dovetail as the original rear sight got in the way of the sight picture. The rifle shoots really well using this set-up, but still shoots a bit high at the lowest possible setting. This isn't a problem as one of the blade elements is quite tall and allows it to sit nicely beneath the aiming point. I tried placing a false, circular aiming point below the actual aiming point to see if the round sight element produced better results. I found the blade foresight easier for me, maybe because it's closer to the standard rear and blade foresight arrangement.
Brian